Depends if you mean Pixar or Disney. yeah I know Disney bought Pixar so that they're techinically the same thing, but I think they still should be considered as two separated companies....Anyway I like Pixar more than Disnay overall.
My favs are Finding Nemo, Up (masterpiece), The Lion King 1 and 2 (3 also wasn't bad, but I prefer the first 2), Pirates of the Carabbean, 101 Dalmatians (1 and 2; the cartoons, not the live action), Mulan (not the 2nd), The Little Mermaid (1 and 2, haven't watched the 3rd but I heard it's a prequel of the 1st) and Hercules ( love Meg's song), Toy Story 3 (never really been a fan of the 1st 2 movies, but the 3rd was beautiful), Lilo and Stitch (only the 1st, the 2nd was stupid and the series were even worse)...